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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HLiBeBCNOFNeHeArClSPSiAlMgNaKCaScTiVCrMnFeCoNiPdRhRuKrBrSeAs is 1485.0967 g/mol

Convert between HLiBeBCNOFNeHeArClSPSiAlMgNaKCaScTiVCrMnFeCoNiPdRhRuKrBrSeAs weight and moles
CompoundMolesWeight, g
HLiBeBCNOFNeHeArClSPSiAlMgNaKCaScTiVCrMnFeCoNiPdRhRuKrBrSeAs

Elemental composition of HLiBeBCNOFNeHeArClSPSiAlMgNaKCaScTiVCrMnFeCoNiPdRhRuKrBrSeAs
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0679
LithiumLi6.94110.4674
BerylliumBe9.01218210.6068
BoronB10.81110.7280
CarbonC12.010710.8087
NitrogenN14.006710.9432
OxygenO15.999411.0773
FluorineF18.998403211.2793
NeonNe20.179711.3588
HeliumHe4.00260210.2695
ArgonAr39.94812.6899
ChlorineCl35.45312.3873
SulfurS32.06512.1591
PhosphorusP30.97376212.0856
SiliconSi28.085511.8912
AluminumAl26.981538611.8168
MagnesiumMg24.305011.6366
SodiumNa22.9897692811.5480
PotassiumK39.098312.6327
CalciumCa40.07812.6987
ScandiumSc44.95591213.0271
TitaniumTi47.86713.2232
VanadiumV50.941513.4302
ChromiumCr51.996113.5012
ManganeseMn54.93804513.6993
IronFe55.84513.7604
CobaltCo58.93319513.9683
NickelNi58.693413.9522
PalladiumPd106.4217.1659
RhodiumRh102.9055016.9292
RutheniumRu101.0716.8056
KryptonKr83.79815.6426
BromineBr79.90415.3804
SeleniumSe78.9615.3168
ArsenicAs74.9216015.0449

Computing molar mass step by step

First, compute the number of each atom in HLiBeBCNOFNeHeArClSPSiAlMgNaKCaScTiVCrMnFeCoNiPdRhRuKrBrSeAs:
H: 1, Li: 1, Be: 1, B: 1, C: 1, N: 1, O: 1, F: 1, Ne: 1, He: 1, Ar: 1, Cl: 1, S: 1, P: 1, Si: 1, Al: 1, Mg: 1, Na: 1, K: 1, Ca: 1, Sc: 1, Ti: 1, V: 1, Cr: 1, Mn: 1, Fe: 1, Co: 1, Ni: 1, Pd: 1, Rh: 1, Ru: 1, Kr: 1, Br: 1, Se: 1, As: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, Li: 6.941, Be: 9.012182, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, Ne: 20.1797, He: 4.002602, Ar: 39.948, Cl: 35.453, S: 32.065, P: 30.973762, Si: 28.0855, Al: 26.9815386, Mg: 24.305, Na: 22.98976928, K: 39.0983, Ca: 40.078, Sc: 44.955912, Ti: 47.867, V: 50.9415, Cr: 51.9961, Mn: 54.938045, Fe: 55.845, Co: 58.933195, Ni: 58.6934, Pd: 106.42, Rh: 102.9055, Ru: 101.07, Kr: 83.798, Br: 79.904, Se: 78.96, As: 74.9216

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HLiBeBCNOFNeHeArClSPSiAlMgNaKCaScTiVCrMnFeCoNiPdRhRuKrBrSeAs) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(B) * Weight(B) + Count(C) * Weight(C) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(F) * Weight(F) + Count(Ne) * Weight(Ne) + Count(He) * Weight(He) + Count(Ar) * Weight(Ar) + Count(Cl) * Weight(Cl) + Count(S) * Weight(S) + Count(P) * Weight(P) + Count(Si) * Weight(Si) + Count(Al) * Weight(Al) + Count(Mg) * Weight(Mg) + Count(Na) * Weight(Na) + Count(K) * Weight(K) + Count(Ca) * Weight(Ca) + Count(Sc) * Weight(Sc) + Count(Ti) * Weight(Ti) + Count(V) * Weight(V) + Count(Cr) * Weight(Cr) + Count(Mn) * Weight(Mn) + Count(Fe) * Weight(Fe) + Count(Co) * Weight(Co) + Count(Ni) * Weight(Ni) + Count(Pd) * Weight(Pd) + Count(Rh) * Weight(Rh) + Count(Ru) * Weight(Ru) + Count(Kr) * Weight(Kr) + Count(Br) * Weight(Br) + Count(Se) * Weight(Se) + Count(As) * Weight(As) =
1 * 1.00794 + 1 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 1 * 18.9984032 + 1 * 20.1797 + 1 * 4.002602 + 1 * 39.948 + 1 * 35.453 + 1 * 32.065 + 1 * 30.973762 + 1 * 28.0855 + 1 * 26.9815386 + 1 * 24.305 + 1 * 22.98976928 + 1 * 39.0983 + 1 * 40.078 + 1 * 44.955912 + 1 * 47.867 + 1 * 50.9415 + 1 * 51.9961 + 1 * 54.938045 + 1 * 55.845 + 1 * 58.933195 + 1 * 58.6934 + 1 * 106.42 + 1 * 102.9055 + 1 * 101.07 + 1 * 83.798 + 1 * 79.904 + 1 * 78.96 + 1 * 74.9216 =
1485.0967 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArAsBBeBrCaClCoCrFFeHeKKrLiMgMnNNaNeNiOPPdRhRuSScSeSiTiV

Computing molar mass (molar weight)

To calculate molar mass of a chemical compound enter its formula and click 'Compute'. In chemical formula you may use:
  • Any chemical element. Capitalize the first letter in chemical symbol and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, O, H, C, N, Na, K, Cl, Al.
  • Functional groups: D, T, Ph, Me, Et, Bu, AcAc, For, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg
  • parenthesis () or brackets [].
  • Common compound names.
Examples of molar mass computations: NaCl, Ca(OH)2, K4[Fe(CN)6], CuSO4*5H2O, nitric acid, potassium permanganate, ethanol, fructose, caffeine, water.

Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows to convert from weight to number of moles and vice versa.

Computing molecular weight (molecular mass)

To calculate molecular weight of a chemical compound enter it's formula, specify its isotope mass number after each element in square brackets.
Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2.

Definitions

  • Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)
  • Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol.
  • Mole is a standard scientific unit for measuring large quantities of very small entities such as atoms and molecules. One mole contains exactly 6.022 ×1023 particles (Avogadro's number)

Steps to calculate molar mass

  1. Identify the compound: write down the chemical formula of the compound. For example, water is H2O, meaning it contains two hydrogen atoms and one oxygen atom.
  2. Find atomic masses: look up the atomic masses of each element present in the compound. The atomic mass is usually found on the periodic table and is given in atomic mass units (amu).
  3. Calculate molar mass of each element: multiply the atomic mass of each element by the number of atoms of that element in the compound.
  4. Add them together: add the results from step 3 to get the total molar mass of the compound.

Example: calculating molar mass

Let's calculate the molar mass of carbon dioxide (CO2):

  • Carbon (C) has an atomic mass of about 12.01 amu.
  • Oxygen (O) has an atomic mass of about 16.00 amu.
  • CO2 has one carbon atom and two oxygen atoms.
  • The molar mass of carbon dioxide is 12.01 + (2 × 16.00) = 44.01 g/mol.

Lesson on computing molar mass

Weights of atoms and isotopes are from NIST article.

Related: Molecular weights of amino acids

molecular weights calculated today
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